Finding the Fourth Proportional to 12,406.32, 17,120.16 and 7,691.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,406.32 : 17,120.16 = 7,691.04 : x
2. Step 2: Convert to fraction form
   12,406.32/17,120.16 = 7,691.04/x
3. Step 3: Cross multiply
   12,406.32x = 17,120.16 × 7,691.04
4. Step 4: Simplify right side
   12,406.32x = 131,671,835.37
5. Step 5: Solve for x
   x = 131,671,835.37/12,406.32
6. Step 6: Final answer
   x = 10,613.29